This is the ACOE study. It did not attach to the last post.http://files.engineering.com/getfile.aspx?folder=cb3658df-acdd-49fe-836b-e4e5c08d962f&file=USCOE_-_Use_of_Geogrids_in_Pavements-_2003.pdf
JMLTCM has yet to reference any study in which "high stregth" geotextiles have been found to provide any benefit in subgrade stabilization. It is always funny to me when people claim things work or are incorrect, but have no actual research to back up the claims. Please post any actual...
To add to the excellent answer by TDAA:
Separation is only needed less than 5% of the time generally. Use these equations to check if separation is required. (Developed by Army Corp for Damn Construction.)
D15(filter)/D85(soil) must be less than 5
D50(filter)/D50(soil) must be less than 25...
Walls and slopes are completely different than subgrade applications. In walls and slope, long term design strength is just about all that matters. So anything with a high LTDS and low creep work well. However, in wall applications fabris is a bad choice for wall heights over 15 ft because...
I would agree with a lot of what you said. However, PP46-01 is not a design methodology. It is general guidance. Based on PP46-01 you could claim nearly any benefit of a geosynthetic you wanted so long as you have 1 test to back it up. That why you get ridiculous claims from geosynthetic...
The fabric would float in the middle. It would not have enough weight to dewater. Though it would not stay on the surface. It would end up as a blob in the middle. Niether at the surface nor the bottom.
I would be interested to see pictures of that as I have never seen any fabric that most people would specify perform in such a manner. There are some extraordinarily high stregth fabrics that may have the same effect, but they are very expensive and not commonly used. I could see one of them...
The hammock effect only works when the edges are pinned between layers of soil. this is not the case here. I attached another picture to show what it looked like before I walked out. If tension had anything to do with it, you would be able to step on a fabric and not sink because of the...
Good geogrids, as previously noted, supply significant load spread on their own due to their innate stiffness. Literally, it is the reason you can roll a good geogrid out on a swamp and walk on it. I have attached a photo of a Job I worked on in Savannah building roads over paper plant sludge...
Burst Strength refers to the ability of a geotextile to resist aggregate punching through the material (i.e., ripping). While burst strength increases with tensile strength, due to the addition of more polymer, you will find that the resistance is more closely associated with the type of...
Fabric and enough fill in any situation will work, you just have to be wary about the long term issues. If it's not a critical application ubder dynamic loading (i.e., under a pavement) and fill is cheap fabric can be a cost effective solution. Grid is generally best when fill prices are very...
thread260-221555
I am starting this thread to set the facts strait on the use of geogrids and geotextiles in subgrade applications because of a recent thread Entitled Geogrid vs. Geotextile where a lot of bad advice was given by OldGeoGuy and JML4TCM, who both after bashing everyone's knowledge...
